Whenever I see a front-page link about Rails, I always think, "I bet the top comment threads will be about the font or layout rather than the content". Click, and... yep!
It's been about ten years, and you don't see as many Rails posts as you used to, but it still holds true!
I've also been around for getting on 10 years (ok, 8.8, close enough) and this is literally the first time I have heard anyone compliment the typography of a Rails post, let alone noticed it occurring enough to become an identifiable trend.
I know this is off topic, but I noticed the typography too and was just seeing if I could tell what it was before looking. But oddly enough, I can't seem to find out what typeface is used using the developer tools for the life of me. Does anyone know how that could be hidden from the styles pane?
The rendered typeface is Stem Text. If you click on an element with the typeface and go to the computed tab that will show you what font-family style is applied.
It's been about ten years, and you don't see as many Rails posts as you used to, but it still holds true!